Measuring Time

Measuring Time ajlill Sat, 12/06/2008 - 16:05

Grade 5

Math

Specific Expectations

Teach the students how to estimate and measure elapsed time using a stopwatch and the wall clock.

Materials

Stopwatches. Worksheet.

Important Terminology

elapsed time, hours, minutes, seconds.

Background Knowledge

Hook

Lesson Sequence

Talk about seconds - how short they are. Ask when you would want to measure time that accurately.
Have students close their eyes and time out 10s. ask if they thought it was longer and shorter
Brainstorm how to estimate time eg 1 mississippi.
Talk about seconds - how short they are. Ask when you would want to measure time that accurately.
Talk about how to measure time. Show how to use a stopwatch using the smartboard.
Move into how to add and subtract time.

Key Questions

When would you need to measure elapsed time to the second?

Assessment

Enrichment

Remediation

Implications for Future Lessons

These skills will be used in the Water Clock Experiment

Measuring Time Worksheet

Measuring Time Worksheet ajlill Mon, 12/08/2008 - 19:41

Grade 5

Math

Name: _____________________________

Remember: 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day.

How to add and subtract time.

Suppose Rilie studies from 3:48 to 7:05, how would you go about calculating how long he studied?
One way is to do addition. He studies 12 minutes to get to 4:00, plus 3 hours to get to 7:00, plus 5 minutes to get to 7:05, for a total of 3:17. This same method can be extended to include seconds, or even days and years.
The other way is to do subtraction, but there's a catch. You have to be careful when borrowing between different units.

7:05	->	6:65
-3:48		-3:48
-------		-------
		3:17

Notice how, when we borrowed from the hour, we only got 60, not 100 as we would have if we were subtracting 348 from 705.

Practice:
4 runners want to recreate the run from Marathon to the Acropolis in Athens. The each leave at 7:45am. Use the runners finish time to calculate the elapsed time

	Finish Time	Elapsed Time
Runner 1	10:52	______________________________
Runner 2	10:34	______________________________
Runner 3	12:14	______________________________
Runner 4	12:05	______________________________

Which runner is the fastest?
Which runners took more that 4 hours?

In your groups, try these activities, and come up with some of your own. Each person in the group should try these and have a partner record the start and end times.

Activity	Estimate	Start time	End time	Elapsed time
1. Sing Jingle Bells
2 10 Jumping Jacks
3. Walk across the classroom
4.
5.
6.
7.
8.

Extend your thinking:
Including washrooms, there are about 7 rooms between us and the office. Calculate how long it would take you to walk to the office.

A Day In the Life

A Day In the Life ajlill Tue, 12/09/2008 - 08:35

Name: __________________________
Record what you do during the next 24 hours on this chart, and calculate the time you spend on each activity. For example, from 3:05 to 3:24 Walk home, 3:24 to 5:00 do homework, ...

Activity	Estimate	Start time	End time	Elapsed time
1.
2
3.
4.
5.
6.
7.
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10.
11.
12.
13.
14.